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Cressi NEWTON Manual

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CNS TOXICITY DISPLAY
Po2 ALARM
PRE DIVE
LOG BOOK
15
INDEX
be done on surface by means of the main screen PRE-DIVE and the DIVE SET screen which allow
visualisation of the previously set parameters.
IMPORTANT: Under the same dive conditions, a Nitrox mixture requires longer no decompression times
than air. It is recommended to comply with the maximum depth allowed by the selected Nitrox mixture.
DIVING WITH NITROX
During a Nitrox dive within the no decompression limits, all the information related to a standard dive with air will
be provided, as well as:
1) “Mx1 or Mx2 or O2” Nitrox dive indicator
2) Graph representing CNS O2 toxicity level
3) Indicator of the mixture used, MIX1 or MIX2.
The second screen, after pressing the UP button, displays the same settings as the DIVE AIR but, of course,
concerning the nitrox mixture used in that moment (MIX1 or MIX2).
CNS TOXICITY DISPLAY.
The Newton computer by Cressi is able to display a graph of the oxygen toxicity level for the Central Nervous
System (CNS). This is related to the Partial Oxygen Pressure and to the time of the diver's exposure to high
Partial Oxygen Pressure (Po2). The level of toxicity of the Oxygen is represented in the display column
consisting of a 5-segment bar, which show the increasing amount of accumulated oxygen. When all the
segments are lit up, it indicates that 100% of the maximum tolerance allowable to the CNS has been reached
and serious danger of hyperoxia exists.
It is important to be able to constantly monitor this data that, being function of the Partial Oxygen Pressure and
the time of exposition, should always be controlled. When the oxygen level reaches warning values, next to the
maximum allowable toxicity (corresponding to 4 segments out of 5 lit up), the graph starts flashing and a
temporary alarm starts sounding, showing the proximity of a CNS toxicity level. If the situation remains
unchanged or if it worsens (100% of allowable toxicity), the bar and the writing continue to flash and the
temporary sound alarm is repeated until, ascending, the Partial Oxygen Pressure decreases below 0.6
atmospheres. At this point, the graph stops flashing, yet the alarm is entered in the Logbook.
REMARK: The result of the oxygen pressure computation is approximated to the nearest whole number.
DANGER: do not use hyper-oxygenated mixtures in diving or decompression without having attended
the related training course. The Nitrox Basic license enables to use just the standard hyper-
oxygenated mixtures (Ean 32 and Ean 36, respectively called Nitrox 1 and Nitrox 2), within the non
decompression limits.
PO2 ALARM.
The computer is able to constantly monitor another basic parameter related to Oxygen: the O2 Partial Pressure
value (Po2). Oxygen toxicity may be caused both by an excessive exposure (CNS toxicity, seen in the previous
chapter) and by exceeding the maximum PO2, which is exceeding the maximum depth allowed by the mixture
used. As already seen, the PO2 limit value is set by the diver in a range between 1.2 bar and 1.6 bar. Newton
considers the 1.6 bar value as the Partial Pressure maximum allowable limit and, according to the mixture
used, automatically signals the maximum depth which may be reached. Remember that, even by using air, you
may reach the oxygen toxicity level. This limit varies according to the PO2 set. Newton is manufactured with a
pre-set value of 1.4 bar, whose corresponding maximum depth is 56.6 m. Of course, you can set the computer
on other PO2 values, up to a maximum of 1.6 bar as long as you are in the NITROX DIVE-S.
To warn the diver about the excess of PO2, the computer has an alarm. When reaching the limit depth related
to the PO2 set (from 1.2 bar to 1.6 bar), a sound alarm will go off while the PO2 icon will be flashing indicating
the current depth. As soon as you return to a depth shallower than the limit one, the sound alarm will stop; the
current depth and the PO2 icon will stop flashing. The latter remains lit up during the residual part of the dive in
the LOG BOOK and in the PRE DIVE screen.
… 15 …


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